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accumulator an apparatus in a hydraulic or pneumatic system that stores and regulates the supply of fluid that provides pressure in the system. [1/3 definitions]
acetylcholine a form of this compound used in medicine for its ability to decrease blood pressure and cause muscular movement in such organs as the alimentary canal. [1/2 definitions]
acupressure a process or technique intended to relieve pain or cure disease by the application of pressure with the hands to specific parts of the body. [1/2 definitions]
Addison's disease a disease caused by disturbance or failure of the adrenal glands, resulting in anemia, low blood pressure, weakness, and an abnormal brownish tinge to the skin.
adiabatic of, relating to, or denoting a process that occurs without loss or gain of heat, such as a change in the volume or pressure of the contents of a container.
aerosol a liquid substance, such as an insecticide, disinfectant, deodorant, or paint, sealed in a container under pressure and dispensed as a fine spray. [1/2 definitions]
air bladder an air-filled sac in various animals and plants, esp. such a structure located near the spine of certain fish that functions to maintain buoyancy by regulating hydrostatic pressure. (See swim bladder.)
air lock an airtight compartment in which the air pressure can be regulated, usu. situated between two areas that have different air pressures, as in underwater operations. [1/2 definitions]
air mass a body of air that covers a wide area and has little horizontal variation in temperature, pressure, or moisture.
air pressure the pressure of compressed air, as in a tire or pump, or the pressure of the earth's atmosphere.
analog computer a computer that uses physical quantities such as pressure or electric voltages to represent data. (Cf. digital computer.)
aneroid barometer a barometer that uses a thin metal disk covering a partial vacuum, such that a change in atmospheric pressure results in a corresponding change in the shape of the disk and moves the indicator needle.
anticyclone a large system of winds that rotates around a center of high barometric pressure, moving clockwise in the Northern Hemisphere and counterclockwise in the Southern, and usu. producing cool, dry weather. (Cf. cyclone.)
arm-twisting (informal) the use of unrelenting or unethical pressure in an effort to persuade someone to do something.
artesian well a well dug through impermeable strata, reaching water that is under pressure.
autoclave a container made to hold superheated steam under pressure, used for sterilizing medical instruments or the like or for cooking. [1/2 definitions]
balloon tire a wide tire with deep walls that is inflated with relatively low air pressure to cushion shocks or facilitate travel on sand.
bar2 a unit of pressure equal to one million dynes per square centimeter.
baro- weight; pressure.
barogram a visual record of atmospheric pressure over time, produced by a barograph.
barograph a barometer that automatically records the atmospheric pressure.